Grate-bar.



7 0 9 1 4 E N U u D E T N E T A P. m. mm 3 E UT RA R .-G H

APPLICATION FILED 00T.6. 1906. RENEWED MAY 2, 1907.

2 SHEETS-SHEET 1.

UNITED STATES PATENT OFFICE.

HENRY TRUESDELL, OF TORONTO,

ONTARIO, CANADA, ASSIGNOR TO THE CORPORATION OF ONTARIO.

GRATE-BAR.

Specification of Letters Patent.

Patented June 4:, 1907.

Application filed October 5, 1905. Renewed May 2,1907. Serial No.371,472.

To all whom it 777/(t1/ concern:

Be it known that I, HENRY TRUESDELL, of the city of Toronto, in thecounty of York and Province of Ontario, Canada, have invented certainnew and useful Improvements in Grate-Bars; and I do hereby declare thatthe following is a full, clear, and exact description of the same.

In my former patent 702891, dated June 17th 1902, I have shown anddescribed a grate bar consisting of a unitary casting, and comprisingtwo ends each having corrugations in their top surfaces, trunnionsformed upon the outer faces of the ends, a lug depending from the lowerportion of one of the ends so that a series of the bars may be securedto be rocked in unison, a pair of parallel side bars connecting the endstogether and having their top surfaces grooved and in line with thecorrugations of said ends, transverse sections parallel with the endsand supported by the side bars, said transverse sections being providedwith corrugations similar in shape and number to the corrugations of theends and having the corresponding ones in line therewith and with thoseof said side bars, said transverse sections having their lower edges inthe same line but above the lower edges of the side bars, and brace websconnected to the inner faces of the ends and adjacent faces of thetransverse sections, intermediate of the side bars so that each braceweb groove is in line with the central corrugations of the ends andtransverse sections.

The present invention relates to an improvement upon the construction ofthe grate bar shown and described in the above mentioned patent andoutlined in the foregoing description whereby the areas of the aircourses between the transverse sections can be increased without anyincrease of the width of the intervals between them and whereby theforce of the draft can be increased as it passes from the bottom to thetop of the grate bar, and the invention further relates to a meanswhereby the clinkers are broken and disintegrated during the rocking ofthe grate bars so that they can be dumped into the ash pit, ashereinafter more fully set forth and more particularly pointed out inthe claims.

For a full understanding of the invention reference is to be had to thefollowing description and to the accompanying drawings in which,

Figure 1 is a perspective view of one of the grate bars. Fig. 2 is anend view of the same. Fig. 3 is a view showing the conformation of oneof the transverse sections. Fig. 4 is a detail view of a portion of oneof the parallel bars looking at its outer face. Fig. 5 is a similar viewof the same looking at its inner face. Fig. 6 is a perspective view ofthe grate bar casting stripped of the transverse sections.

Like letters of reference refer to like parts throughout thespecification and drawings.

The grate bar constituting the present invention may be described asconsisting of a unitary casting comprising two ends a, at having curvedtop surfaces 1), trunnions 0 formed on the outer faces of the ends a a,a depending lug d from the lower portion of one of the ends so that aseries of bars may be secured to be rocked in unison, a pair of parallelside bars 6 connecting the ends together and having their top surfaces fbelow the plane of the top surfaces of the ends, a series of transversesections 9 parallel with the ends and having their top surfaces 7tcurved to correspond with the curvature of the top surfaces thereof andin the same curvilinear plane so that the top surfaces of the side barswill be the same distance below the top surfaces of the transversesections as they are'below the top surfaces of the ends, to form aircourses all of equal capacity, between the top surfaces of the side barsand the transverse sections, the ends a a and the transverse sectionsprojecting equally beyond the outer faces of both side bars and theprojecting ends of the transverse sections strengthened by brace webs iextending from near their top surfaces to the outer faces of the sidebars, and the middle parts of the transverse sections strengthened byarched brace webs j united with the inner faces of the side bars but notextending to their lower edges.

The side bars are substantially wedge shape in cross section with thesides converging from their top to their bottom edges and of greaterthickness at their upper than at their lower parts to sustain the loadupon the grate bars while the transverse sections are of IOC a similarshape, in cross section to retard their destruction by the erosive andcorrosive action of the fire and to facilitate the unrestriatedcirculation of the air currents.

To increase the areas of the air courses I without increasing the widthof the intervals between the transverse sections, the inner and outerfaces of the side bars have vertical channels 7c and k respectivelylocated at the ends of the intervals between the transverse 5 sectionsand extending from. the top edges of the side bars to the lower edges ofthe brace webs. The brace webs j do not extend to the bottom of theinner faces of the side bars and as the channels Zr only extend to thebottom of the brace webs the area of the opening between the side barsmay be in creased by forming channels Z in their inner faces from thebrace webs to their lower edges, said channels Zbeing located out ofline with the channels 7c and directly opposite the ridges m between thechannels /c on the outer faces of the side bars so that the side barswill not be materially weakened by the presence of the channels L Theair currents enter at the bottom of the grate bar between the innerfaces of the side bars and the ends, the channels Zincreasing the areaof the opening thereof to allow of the perfect combustion of admissionof the greatest possible volume of air. The air ascends through thespace be-' tween the inner faces of the side bars and ends and throughthe air courses formed by the intervals between the transverse sectionsintermediate the side bars the capacity of which has been increased bythe presence of the channels but Without any increase in the width ofthe intervals between the transverse sections. The air currents alsocourse up the outer faces of the side bars and through the intervalsbetween the projecting parts of the transverse sections the capacity ofwhich has been increased by the presence of the channels it. The airwhen it reaches the top of the side bars passes through the air coursesformed between the top surfaces of the side bars and the top surfaces ofthe transverse sections so that the whole of the fuel will be subjectedto the action of the air currents and a practically perfect combustionwill be effected.

The grate bars when mounted in the fire box are arranged in parallelplanes and their lugs are coupled together so that they may be rocked inunison to clear the fire of ashes, clinkers and other refractorysubstances which if solidified would retard the action of the aircurrents. To crush the clinkers, the ends of' the. transverse sectionsproject slightly beyond the edges of the brace webs to form clinkerbreakers m which engage the clinkers and crush them as the grate barsare rocked so that the crushed clinkers may pass into the ash pitthrough the openings between the grate bars.

By means of the above described construction it is possible to supplysufficient atmospheric air to the fire to insure a practically ing theprojecting ends of the transverse sections so that they will engage andcrush the clinkers it is possible to remove all solidrefractorysubstances from the top surfaces of the grate bars as they are rockedupon their trunnions.

Having thus fully described. my invention what I claim as new and desireto secure by Letters Patent is l. A grate bar consisting of a unitarycasting comprising two ends, trunnions formed on the outer facesthereof, a depending lug from the lower portion of one of the ends, sothat a series of the grate bars may be secured to be rocked in unison,and a pair of side bars connecting the ends together and having theirtop surfaces below the plane of the top surfaces of the ends, transversesections parallel with the ends and having their top surfaces tocorrespond with the top surfaces of the ends and in the same planetherewith so that the top surfaces of the side bars will be the samedistance below the top surfaces of the transverse sections as they arebelow the top surfaces of the ends to form air courses all of equalcapacity between the top surfaces of the side bars and those of thetransverse sections and ends, the ends and the transverse sectionsprojecting equally beyond the outer faces of both side bars, theprojecting ends of the transverse sections strengthened by brace websextending from the fuel and by arrangnear their top surfaces to theouter faces of f the side bars, the middle parts of the transversesections strengthened by brace webs extending to the inner faces of theside bars, channels formed in the inner and outer faces of the side barsat the intervals between the transverse sections and extending to thebottom of the brace webs, and other channels formed in the inner facesof the side bars'extending from the brace webs to the lower edges of theside bars.

2. A grate bar consisting of a unitary casting comprising two ends,trunnions formed on the outer faces thereof, a depend ing lug from thelower portion of one of the ends, so that a series of the grate bars maybe secured to be rocked in unison, and a pair of bars connecting theends together and having their top surfaces below the plane of thetopsurface thereof, transverse sections supported by the side bars andhaving their top surfaces to correspond with the top surfaces of theends and in the same plane therewith so that the top surfaces of theside bars will be the same distance below the top surfaces of thetransverse sections as they are below the top surfaces of the ends toform air courses, all of equal capacity, between the top surfaces of theside bars and those of the IIO transverse sections and ends, the endsand the transverse sections projecting equally be yond the outer facesof both side bars, the projecting ends of the transverse sectionsstrengthened by brace webs extending from near their top surfaces to theouter faces of the parallel bars, the middle parts of the transversesections strengthened by brace webs extending to the inner faces of theparallel bars, channels formed in the inner and outer faces of the sidebars at the intervals to be rocked in unison, and a pair of side barsconnecting the ends together, transverse sections supported by the sidebars and parallel with the ends and projecting beyond the outer faces ofthe side bars, brace webs form-,

ing an integral part of the transverse sections and extending to theouter faces of the side bars, other brace webs extending from the middleparts of the transverse sections to the inner faces of the side bars,channels formed in the inner and outer faces of the side bars at theintervals between the transverse sections and extending to the bottom ofthe brace webs, and other channels formed in the inner faces of the sidebars extending from the brace webs to the lower edges of the side bars.

Toronto, July 15th, A. D. 1905.

- HENRY TRUESDELL.

Signed in the presence of- CHAS. H. RIoHEs, W H. L. TRIMBLE.

